SST12B-800CW vs SST138C-600E
| Part Number |
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| Category | Thyristors - TRIACs | Thyristors - TRIACs |
| Manufacturer | SMC Diode Solutions | SMC Diode Solutions |
| Description | 800V 12A PACKAGE TO-220B 3-QUADR | 600V 12A PACKAGE TO-220C 4-QUADR |
| Package | -Reel® | Cut Tape (CT) |
| Series | SST12 | SST138 |
| Operating Temperature | -40°C ~ 125°C (TJ) | -40°C ~ 125°C (TJ) |
| Mounting Type | Through Hole | Through Hole |
| Package / Case | TO-220-3 | TO-220-3 |
| Supplier Device Package | TO-220B | TO-220C |
| Configuration | Single | Single |
| Current - Hold (Ih) (Max) | 40 mA | 25 mA |
| Voltage - Off State | 800 V | 600 V |
| Voltage - Gate Trigger (Vgt) (Max) | 1.3 V | 1.5 V |
| Current - Gate Trigger (Igt) (Max) | 35 mA | 25 mA |
| Current - On State (It (RMS)) (Max) | 12 A | 12 A |
| Current - Non Rep. Surge 50, 60Hz (Itsm) | 120A @ 50Hz | 95A @ 50Hz |
| Triac Type | Standard | Standard |
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1. What is a TRIAC, and how does it differ from an SCR?
A TRIAC is a bidirectional device that can control AC power, effectively working as two SCRs in parallel but in opposite directions. Unlike an SCR, which only conducts in one direction, a TRIAC operates in both directions, making it ideal for AC applications.
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2. Why do TRIACs require a DIAC for triggering?
DIACs improve the symmetry of TRIAC firing by ensuring consistent triggering voltages in both directions. This reduces harmonic distortion in AC circuits, enhancing performance.
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3. What are the limitations of TRIACs?
TRIACs are less efficient for high-power or complex control systems due to asymmetric triggering and potential noise issues. They are more suited to low-to-medium power applications.
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4. How can flickering in TRIAC circuits be minimized?
Flickering can be addressed by proper circuit design, including snubber circuits to handle dv/dt issues and filtering to reduce noise and harmonics.
